This is an optional Revolution Design Racing Products RC10B5/RC10B5M Aluminum Shock Spring Cup Set. The B5 series aluminum spring cups in +5mm offset configuration are a direct replacement for the stock plastic cups and improve spring fitment and overall rigidity for optimized suspension performance. These are especially useful on high-bite surfaces that put a lot of stress on the suspension. The parts are CNC-machined from aircraft-quality 7075-T6 aluminum, super lightweight at 1.65g per piece, and are blue anodized and laser-etched for that ultimate factory look.

Note: The plastic shock eyelet has a molded number on it. For proper fitment with these aluminum cups, ensure the number falls in between the notch in the aluminum cup. Otherwise the eyelet will not fit all the way down in the cup.